logout() now creates a dialog asking the user if they wish to logout.

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -16,6 +16,7 @@
 package com.keylesspalace.tusky;
 
 import android.app.NotificationManager;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
@@ -30,6 +31,7 @@ import android.support.design.widget.TabLayout;
 import android.support.graphics.drawable.VectorDrawableCompat;
 import android.support.v4.app.Fragment;
 import android.support.v4.view.ViewPager;
+import android.support.v7.app.AlertDialog;
 import android.text.SpannableStringBuilder;
 import android.text.Spanned;
 import android.text.TextUtils;
@@ -337,6 +339,12 @@ public class MainActivity extends BaseActivity implements SFragment.OnUserRemove
     }
 
     private void logout() {
+        new AlertDialog.Builder(this)
+                .setTitle(R.string.action_logout)
+                .setMessage(R.string.action_logout_confirm)
+                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
                         if (arePushNotificationsEnabled()) disablePushNotifications();
 
                         getPrivatePreferences().edit()
@@ -348,6 +356,10 @@ public class MainActivity extends BaseActivity implements SFragment.OnUserRemove
                         startActivity(intent);
                         finish();
                     }
+                })
+                .setNegativeButton(android.R.string.no, null)
+                .show();
+    }
 
     private void setupSearchView() {
         searchView.attachNavigationDrawerToMenuButton(drawer.getDrawerLayout());